Router= PC , HUb= switch
straight-Through cable(Direct) : 타입이 다른경우 (실선)
router-Hub, router-switch , pc-hub, pc- switch
Crossover Cable(cross) : 타입이 같은 경우(점선)
router-router, pc-pc, hub-hub, switch-switch,router-pc, hub-switch
Rollover Cable(console) : Router/Switch 셋팅